<!DOCTYPE html>
<html lang="en">
<head>
    <meta http-equiv="Content-Type" content="text/html" charset="UTF-8">
    <title>首页</title>
    <link rel="stylesheet" type="text/css" href="css/tx1.css"/>
    <style>
        body {
            margin: 0;
            padding: 0;
            font-family: sans-serif;
            background: url(/img/background.jpg) no-repeat center 0px;
            background-size: cover;


            background-position: center 0;
            background-repeat: no-repeat;
            background-attachment: fixed;
            -webkit-background-size: cover;
            -o-background-size: cover;
            -moz-background-size: cover;
            -ms-background-size: cover;

        }

        .login-box {
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            width: 400px;
            padding: 40px;
            background: rgba(0, 0, 0, .8);
            box-sizing: border-box;
            box-shadow: 0 15px 25px rgba(0, 0, 0, .5);
            border-radius: 10px;
        }

        .login-box h2 {
            margin: 0 0 30px;
            padding: 0;
            text-align: center;
            color: #fff;
        }

        .login-box .login-field {
            position: relative;
        }

        .login-box .login-field input {
            width: 100%;
            padding: 10px 0;
            font-size: 16px;
            color: #fff;
            margin-bottom: 30px;
            border: none;
            border-bottom: 1px solid #fff;
            outline: none;
            background: transparent;
        }

        .login-box .login-field label {
            position: absolute;
            top: 0;
            left: 0;
            letter-spacing: 1px;
            padding: 10px 0;
            font-size: 16px;
            color: #fff;
            pointer-events: none;
            transition: .5s;
        }

        .login-box .login-field input:focus ~ label,
        .login-box .login-field input:valid ~ label {
            top: -23px;
            left: 0;
            color: aqua;
            font-size: 12px;
        }

        .login-box button {
            background: transparent;
            border: none;
            outline: none;
            color: #fff;
            background: #03a9f4;
            padding: 10px 20px;
            cursor: pointer;
            border-radius: 5px;
        }
    </style>
</head>
<body>


<div class="login-box">
    <h2>登录</h2>
    <form action="/ManagerController/login" method="post">
        <div class="login-field">
            <input type="text" name="username" required="required"
            title="请输入用户名"/>
            <label>用户名</label>
        </div>
        <div class="login-field">
            <input type="password" name="password" required="required"
                   pattern="^[a-zA-Z0-9_]{4,16}$"
                   title="密码为8到16位（字母，数字，下划线）"/>
            <label>密码</label>
        </div>
        <button type="submit">登录</button>
        <button type="reset">重新填写</button>
    </form>
</div>


</body>
</html>